There are no leaves when saplings grow into trees, have also noticed the same happening with atmospheric saplings. World gen would load them in just fine but when planted as a sapling it just grows the log..
This is for version 1.20.1 so I understand things are most likely to be buggy right after release lol Im sorry if I missed anything, I couldnt imagine it being mentioned in logs? but I can def send one if it's needed though its not like theres a crash log or anything

I'm sorry I am new to bug reports so I'm not sure what other details I need to add, but ty for your time nevertheless :)

Send your latest.log, but its likely a mod incompatibility as I haven't experienced this nor have I seen any other reports of it

I created a new world and used bone meal on a sapling just to hopefully make the log a bit shorter--but that kinda went to shit and the log surpassed GitHub's limit, and I'm sorry it's super long I'm not sure which parts would be unrelated so idk how to narrow it down and I kinda pasted the whole latest.log but I hope this works regardless:
Link to Log

After going through and making little adjustment tests, I've found that this issue only happens with the DragN's Livestock Overhaul mod being used alongside it. I'll report an issue over there, but I'm not sure how to go about this really? Thank you for your patience

Looks like they'll be fixing it: DragN0007/Overhauled-Livestock#38